yes it happens with several pets in the house...I had an air conditioner break down because of cat hair! I wasn't changing the filter often enough because it was an old model and very hard to take out/replace the filter for these old arthritic hands. I didn't realize how bad it was til it broke and the guy showed me the cat hair on the old A/C ! now I have a new one and it is easier to replace the filters every month, must be done each month. I am also having trouble with my fridge but not the freezer I think it may be because of cat hair also but I am not sure what to do other than to vacuume the vent on the front bottom of the fridge, I have done that and it still is not working well I might have to pull it out and vacuume the back of the fridge, but I don't know why only the fridge part is a problem and not the freezer part.

thanks for your post, too bad it wasn't posted last year!